Multi-scale self-adaptive fixing system for lead plate

Abstract

The invention relates to the technical field of radiation protection equipment, and provides a multi-scale self-adaptive fixing system for a lead plate, in the aspect of lead plate fixing, through a three-degree-of-freedom structure and a precise force control system of a shape memory alloy driving clamp, the clamping angle and force can be adjusted in a self-adaptive manner, the plastic deformation of the lead plate is effectively avoided, and the service life of the lead plate is prolonged. The problem that a traditional clamp is poor in fixing precision is solved. And due to the innovative structure of the modular quick connection assembly, the assembly and the disassembly are convenient, the seam leakage rate is greatly reduced, and the radiation protection performance is improved. In terms of environmental adaptation, the temperature and humidity cooperative control system can accurately adjust the temperature of the lead plate, and the self-repairing nano ceramic anti-corrosion coating can effectively isolate corrosion ions and automatically repair the coating. The intelligent monitoring and early warning system utilizes a multi-dimensional sensor, edge calculation and digital twinning technology to monitor the state of equipment in real time, quickly diagnose faults and perform graded early warning, so that the safe and stable operation of the system is guaranteed, and the reliability and the intelligent level of the equipment are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation protection equipment, and in particular to a multi-scale adaptive fixing system for lead plates. Background Art

[0002] CT technology is widely used in modern medical imaging equipment, but CT equipment generates radiation during operation. Lead plates are commonly used radiation shielding materials, and their installation and protection system performance are crucial.

[0003] Traditional lead plate fixing and protection technologies have many defects. In terms of mechanical fixing, ordinary clamps are difficult to adapt to the flatness error during lead plate installation, and the clamping force control accuracy is low, which can easily cause plastic deformation of the lead plate during use, affecting its shielding effect and service life. In addition, traditional clamps are inconvenient to disassemble and assemble, and consume a lot of time and manpower when maintaining equipment or replacing lead plates. In terms of environmental adaptability, traditional systems cannot effectively cope with different temperature and humidity environments, and lead plates are susceptible to corrosion, which shortens the overall service life of the equipment. At the same time, traditional protection systems lack effective intelligent monitoring methods and cannot grasp the fixing status of the lead plate, radiation leakage, and equipment operation stability in real time. Once a fault occurs, it is difficult to detect and deal with it in time, which may cause radiation leakage and pose a threat to the health of medical staff and patients.

[0004] Therefore, a multi-scale adaptive fixation system for lead plates is proposed. Through innovative mechanical fixation structure, environmental control technology, and intelligent monitoring and early warning mechanism, the accuracy and stability of lead plate installation are improved, its environmental adaptability is enhanced, and real-time monitoring of equipment status and fault early warning are achieved, thereby ensuring the radiation protection effect and promoting the development of radiation protection technology for medical imaging equipment. Summary of the Invention

[0005] Technical problems solved

[0006] In view of the deficiencies of the prior art, the present invention provides a multi-scale adaptive fixing system for lead plates.

[0007] Technical Solution

[0008] To achieve the above-mentioned solution, the present invention provides the following technical solution: a multi-scale adaptive fixation system for lead plates, comprising a multi-scale adaptive mechanical fixation module, an environmental adaptive control module and an intelligent monitoring and early warning system.

[0009] The multi-scale adaptive mechanical fixation module includes a shape memory alloy drive clamp and a modular quick connection assembly; the clamping arm of the shape memory alloy drive clamp is a three-degree-of-freedom structure, including a base, a rotation joint, a telescopic arm and an end pressure-bearing surface; the shape memory alloy drive clamp adopts a dynamic force control and vibration suppression system, including an NTC thermistor, a PID controller and a magnetorheological fluid damping chamber; the modular quick connection assembly adopts a "cross trapezoidal tenon + elastic buckle" structure.

[0010] The environmental adaptive control module includes a temperature and humidity coordinated control system and a lightweight composite lead plate; the temperature and humidity coordinated control system includes a dynamic temperature compensation device and a self-repairing nano-ceramic anti-corrosion coating.

[0011] The intelligent monitoring and early warning system includes a multi-dimensional sensor array, edge computing and digital twin system, and communication and early warning mechanism; the multi-dimensional sensor array includes a vibration and displacement monitoring unit and a radiation dose monitoring unit; the vibration and displacement monitoring unit includes a MEMS acceleration sensor and a laser displacement sensor.

[0012] Preferably, the base is made of 7075-T6 aluminum alloy and is hard anodized; the rotary joint is configured with a biaxial flexible hinge; the telescopic arm has a built-in SMA coil spring; the end pressure-bearing surface is an arc-shaped surface, and the surface is sprayed with a 20μm polytetrafluoroethylene coating.

[0013] Preferably, the NTC thermistor has an accuracy of ±0.3°C, a temperature-stress mapping relationship is established based on the Burgers model, and the clamping force is adjusted to 50-500N by a 0-12V driving voltage; the magnetorheological fluid damping cavity is a coaxial cylindrical type, filled with MRF-132DG magnetorheological fluid with 65% carbonyl iron powder.

[0014] Preferably, the quick disassembly and assembly structure adopts a "vacuum adsorption + mechanical locking" composite structure, with a 10mm diameter micro vacuum suction cup embedded in the pressure-bearing surface, a suction force of 5-50N, and a response time of ≤1 second; the fixture and the support structure are connected by M6 quick-release bolts, with a torque of 8-12N·m, and a disassembly and assembly time of ≤30 seconds.

[0015] Preferably, the main tenon of the modular quick connection assembly has a trapezoidal cross-section, a fitting tolerance of H7 / g6, and can withstand a lateral tensile force of 500N when the insertion depth is ≥8mm; the auxiliary buckle has a built-in stainless steel spring sheet with a thickness of 0.3mm and an elastic coefficient of 5N / mm.

[0016] Preferably, the main material of the modular quick connection component is TC4 titanium alloy, which is subjected to hot isostatic pressing treatment at 1200°C and 150MPa, and a 5μm DLC coating is deposited on the surface; a 1mm thick Ω-type lead sealing strip is embedded in the joint.

[0017] Preferably, the heating unit of the dynamic temperature compensation device is a 0.3mm thick PTC ceramic heating plate; the cooling unit is a 2mm diameter copper tube micro condenser with a serpentine pipe layout, and a temperature control of 40±2°C at a flow rate of 0.5L / min; the temperature control adopts a fuzzy PID controller, the PT100 sensor has an accuracy of ±0.5°C, a response time ≤10 seconds, and a fluctuation range of ±2°C.

[0018] Preferably, the bottom layer of the self-repairing nano-ceramic anti-corrosion coating is a 5μm SiO2 nanosol layer with a porosity of ≤5%, the surface layer is a 5μm DCPD microcapsule polyurethane layer, the microcapsule particle size is 5-10μm, the content is 15wt%, the tensile strength recovery rate after repair is ≥85%, and the weight loss rate after immersion in 5% NaCl solution for 1000 hours is ≤0.2%.

[0019] Preferably, the lightweight composite lead plate is made of graphene-reinforced lead-based composite material, lead powder and graphene oxide are mixed at a ratio of 99:1, and are prepared by high-energy ball milling, hydrogen reduction, and sintering, with a density of 11.15 g / cm 3 , tensile strength 230MPa, 3mm thickness lead equivalent 3.1mmPb; edge processing 45° groove, sealant mixed with 5wt% nano-lead particles, seam leakage rate ≤0.07%.

[0020] Preferably, the radiation dose monitoring unit adopts a dual-redundant scintillator dosimeter, the main sensor is a NaI (Tl) crystal, and the backup sensor is a Si semiconductor detector; the edge computing hardware integrates an NPU with a computing power ≥ 2TOPS, a 1.8GHz CPU and 4GBRAM, and the algorithm adopts an LSTM-CNN fusion model; the communication supports 5GNR and NB-IoT dual modes, adopts AES-256 encryption, and the response time of the three-level warning strategy is ≤30 seconds and ≤5 seconds respectively.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a multi-scale adaptive fixation system for lead plates, which has the following beneficial effects:

[0023] 1. This multi-scale adaptive fixation system for lead plates, in terms of lead plate fixation, can adaptively adjust the clamping angle and force through the three-degree-of-freedom structure of the shape memory alloy-driven clamp and the precise force control system, effectively avoiding plastic deformation of the lead plate and solving the problem of poor fixation accuracy of traditional clamps; the innovative structure of the modular quick-connect components is not only easy to install and disassemble, but also greatly reduces the seam leakage rate and improves radiation protection performance.

[0024] 2. The lead plate's multi-scale adaptive fixing system has an environmental adaptability. The temperature and humidity coordinated control system can accurately adjust the lead plate's temperature. The self-repairing nano-ceramic anti-corrosion coating can effectively isolate corrosive ions and automatically repair the coating. The intelligent monitoring and early warning system uses multi-dimensional sensors, edge computing, and digital twin technologies to monitor equipment status in real time, quickly diagnose faults, and issue graded early warnings to ensure safe and stable system operation, greatly improving the reliability and intelligence of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the system framework of the present invention;

[0026] Figure 2 Schematic diagram of the system flow of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] See also Figures 1 and 2 The present invention proposes a multi-scale adaptive fixing system for lead plates, comprising the following contents:

[0029] Module 1: Multi-scale adaptive mechanical fixation module

[0030] (1) Shape memory alloy driven fixture

[0031] 1. Three-dimensional adaptive clamping structure design

[0032] The clamp body uses a Ti-Ni-based shape memory alloy as the driving core, and constructs a three-degree-of-freedom clamping arm structure. The clamping arm consists of a base, a rotating joint, a telescopic arm, and a pressure-bearing surface at the end. Among them, the base is made of 7075-T6 aluminum alloy and is hard-anodized with a film thickness of 25μm. It has excellent salt spray corrosion resistance, salt spray corrosion resistance time is not less than 1000 hours, and tensile strength is not less than 500MPa; the rotating joint is equipped with a dual-axis flexible hinge, which can achieve ±15° rotation, so that the clamping arm can adaptively adjust the angle within the range of ±10° in the normal direction of the lead plate surface, effectively compensating for the flatness error during lead plate installation (error value ≤2mm / m); the telescopic arm has a built-in SMA coil spring, whose phase change temperature is in the range of 40-60℃. It is driven by Joule effect heating, with a travel range of 5-30mm and a displacement accuracy of up to ±0.05mm; the end pressure-bearing surface is designed as an arc-shaped surface, and its curvature radius is set at 5-50mm according to the thickness of the lead plate, corresponding to a lead plate with a thickness of 0.5-50mm. The surface is sprayed with a 20μm thick polytetrafluoroethylene coating with a friction coefficient not exceeding 0.1, which can prevent the lead plate surface from being scratched during clamping.

[0033] 2. Dynamic force control and vibration suppression system

[0034] The adaptive clamping force algorithm monitors the SMA's operating temperature in real time via an integrated NTC thermistor (accuracy of ±0.3°C). Based on the Burgers model, it establishes a mapping between temperature and stress. Using a PID controller to adjust the drive voltage from 0-12V, it achieves continuously adjustable clamping force from 50 to 500N, with an accuracy of ±3N. Experimental data shows that for a 2mm thick lead plate, this system can control the local stress at the fixing point to below 50MPa, compared to 82MPa with conventional clamps, effectively preventing plastic deformation of the lead plate.

[0035] The magnetorheological fluid damping chamber utilizes a coaxial cylindrical structure with an inner diameter of 20mm, an outer diameter of 25mm, and an effective length of 50mm. It is filled with magnetorheological fluid (MRF-132DG) containing 65% carbonyl iron powder. When a current of 0-1.5A is applied to the coil winding, it produces a shear yield strength of 0-50kPa, enabling continuous adjustment of the damping coefficient from 15 to 1500N·s / m. In vibration tests ranging from 10 to 1000Hz, the damping system achieved an energy attenuation rate of 92% at a typical 50Hz vibration frequency for CT equipment, with a displacement suppression accuracy of ±0.01mm.

[0036] 3. Quick disassembly and assembly structure design

[0037] The interface between the fixture and the lead plate utilizes a composite structure combining vacuum suction and mechanical locking. A 10mm diameter micro vacuum cup is embedded within the pressure-bearing surface, offering a suction force range of 5-50N. During installation, the negative pressure suction response time is less than 1 second. Once positioned, the SMA telescopic arm applies mechanical clamping force, ensuring rapid and precise positioning of the lead plate. The fixture is connected to the support structure via M6 quick-release bolts with a torque range of 8-12N·m. A single fixture can be disassembled and assembled in less than 30 seconds, facilitating rapid on-site replacement.

[0038] (2) Modular quick-connect components

[0039] 1. Three-dimensional mortise and tenon precision joint structure

[0040] It adopts a composite connection structure of "cross trapezoidal tenon + elastic clip". The main tenon is designed with a trapezoidal cross-section, with an upper base of 8mm, a lower base of 12mm, a height of 10mm, and an angle of 15°. The fitting tolerance complies with the H7 / g6 standard. When inserted to a depth of at least 8mm, it can withstand a lateral tensile force of 500N. The secondary clip has a built-in stainless steel spring sheet with a thickness of 0.3mm and an elastic coefficient of 5N / mm. The clip protrusion is 2mm high, forming an interference fit with the mortise groove. The fitting clearance does not exceed 0.05mm, and it can provide an axial preload of 10-20N. The end of the tenon is set with a 45° chamfer to match the guide bevel in the mortise, realizing automatic centering during blind installation, with a centering accuracy of ±0.1mm.

[0041] 2. High-performance materials and surface treatment

[0042] The main material is titanium alloy TC4, formed using SLM selective laser melting technology. Its chemical composition is Ti-6Al-4V. After hot isostatic pressing at 1200°C and 150MPa, it has a tensile strength of no less than 900MPa and a fatigue life of no less than 1×10^6 cycles at a stress of 400MPa. A 5μm-thick diamond-like carbon coating (DLC) is deposited on the surface using plasma-enhanced chemical vapor deposition (PECVD). The coating has a hardness of no less than 20GPa, a coefficient of friction of no more than 0.12, and is resistant to at least 1000 wipes with medical alcohol. A single connection component weighs no more than 50g, approximately 60% of the weight of an aluminum alloy component of equivalent strength, making it suitable for the installation of large-span lead plates with a maximum span of 3m.

[0043] 3. Seam shielding reinforcement technology

[0044] When adjacent lead sheets are butted together, an Ω-shaped lead sealing strip is inserted into the mortise and tenon joints. The strip is 1mm thick, 25mm wide, and has a lead equivalent of no less than 1mmPb. A special pressure roller tool applies a pressure of 50-80N / cm to compact the joint, keeping the gap within 0.1mm. Radiation leakage testing based on the ISO12127-1 standard shows that this structure can control the leakage rate at the joint to below 0.08%, a significant improvement over the 5% leakage rate of traditional overlapped structures.

[0045] Module 2: Environmental Adaptive Control Module

[0046] (1) Temperature and humidity coordinated control system

[0047] 1. Dynamic temperature compensation device

[0048] The heating unit uses a 0.3mm thick PTC ceramic heating sheet with a resistance temperature coefficient of not less than 15% / K. Through finite element thermal analysis to optimize the layout, the grid is distributed with a spacing of 200mm, and the power density is set at 8-18W / ㎡. Under a -20℃ environment, the surface temperature of the lead plate can be increased to 10±1.5℃. A 0.5mm thick thermal conductive silicone sheet with a thermal conductivity of 3.0W / (m·K) is laid between the heating sheet and the lead plate, and the thermal resistance does not exceed 0.2℃·m 2 / W.

[0049] The cooling unit integrates copper micro-condensers with a diameter of 2mm and a wall thickness of 0.3mm. The tubes are arranged in a serpentine pattern with a spacing of 50mm. Circulating cooling water at a flow rate of 0.5L / min keeps the lead plate temperature within 40±2°C in a 60°C environment. The condensers are coated with a 100nm thick nano-silver coating, achieving an antibacterial rate of at least 99%, effectively inhibiting microbial growth.

[0050] The temperature control adopts a fuzzy PID controller, and the surface temperature signal of the lead plate is fed back by a PT100 sensor with an accuracy of ±0.5°C. The heating / cooling switching response time does not exceed 10 seconds, and the temperature fluctuation range is controlled at ±2°C, which is a significant improvement compared to the ±5°C fluctuation range of the traditional system.

[0051] 2. Self-repairing nano-ceramic anti-corrosion coating

[0052] The coating system consists of two layers. The bottom layer is a 5μm thick SiO2 nanosol layer, which forms a three-dimensional network structure through hydrolysis and polycondensation reaction. The porosity does not exceed 5%, which can effectively isolate corrosive ions such as Cl- and SO42-, and its diffusion coefficient does not exceed 1×10^-12cm 2 / s; the surface layer is a 5μm thick polyurethane layer containing DCPD microcapsules, the microcapsules have a particle size of 5-10μm and a content of 15wt%, the shell material is urea-formaldehyde resin, the wall thickness is 1μm, and the core material is a mixed solution of dicyclopentadiene (DCPD) and a Grubbs catalyst with a concentration of 5wt%.

[0053] When cracks less than 50 μm in width develop in the coating due to mechanical impact or chemical corrosion, stress concentration at the crack tip causes the microcapsules to rupture, releasing DCPD monomers. Ring-opening metathesis polymerization (ROMP) occurs under the action of a catalyst, forming a polydicyclopentadiene (PDCPD) repair layer within 2 hours. Testing according to ASTM D638 standards shows that the tensile strength recovery rate of the repaired coating is no less than 85%. After immersion in a 5% NaCl solution for 1000 hours, the coating loses no more than 0.2% in weight. After 500 wipes with a chlorine-containing disinfectant containing 1000 ppm of effective chlorine, the surface corrosion depth does not exceed 10 μm, significantly better than the 50 μm corrosion depth of traditional epoxy coatings.

[0054] (2) Lightweight composite lead plate

[0055] 1. Graphene-enhanced lead-based composites

[0056] The preparation process adopts powder metallurgy. First, lead powder with a purity of not less than 99.99% and a particle size of 50-100μm is mixed with graphene oxide (GO) with an oxygen functional group content of 15wt% in a mass ratio of 99:1. Under argon protection, it is uniformly dispersed by high-energy ball milling at 400rpm for 6 hours. Then, the mixed powder is reduced by hydrogen at a flow rate of 500mL / min at 250℃ for 2 hours to convert GO into graphene (rGO). The resulting graphene sheet has a thickness of 3-5nm and a lateral size of 1-5μm. Finally, it is sintered at a pressure of 150MPa and a temperature of 200℃ for 2 hours to prepare a density of 11.15g / cm 3 , composite panels with a relative density of not less than 98%.

[0057] The performance parameters of this composite plate are excellent, with a tensile strength of 230MPa (pure lead plate is only 45MPa), an elongation of 18% (pure lead plate 40%), and a hardness HB of 45 (pure lead plate 30); the lead equivalent of a 3mm thick composite plate is 3.1mmPb, which is 3% higher than the lead equivalent of 3.0mmPb of a pure lead plate. The thermal expansion coefficient is 26×10^-6 / ℃, which is lower than the 29×10^-6 / ℃ of a pure lead plate, and can effectively reduce the deformation stress caused by temperature changes.

[0058] 2. Edge sealing optimization design

[0059] The edge of the lead plate is processed by CNC milling machine with a 45° groove, a width of 10mm, and a surface roughness Ra not exceeding 3.2μm to ensure that the effective contact area between the sealant and the lead plate is not less than 90%. The sealing material is selected with a Shore hardness of A52 and a density of 1.2g / cm 3The silicone-based sealant has a tensile strength of no less than 1.5 MPa, an elongation at break of no less than 300%, and adhesion to lead plates of no less than 5 MPa after curing (according to ASTM D3330). 5 wt% of 50 nm nano-lead particles are incorporated into the sealant, ensuring a lead equivalent of no less than 1 mmPb at the joint. The sealing process utilizes an automatic glue applicator with a 12 mm wide and 1 mm thick strip. After lamination, a linear pressure of 50 N / m is applied. After curing for 24 hours, the measured joint leakage rate does not exceed 0.07%, significantly lower than the 0.5% leakage rate of traditional sealing processes.

[0060] Module 3: Intelligent Monitoring and Early Warning System

[0061] (1) Multi-dimensional sensor array

[0062] 1. Vibration and displacement monitoring unit

[0063] The MEMS accelerometer is a triaxial device with a ±50g range, 0.1mg resolution, a frequency response range of 0-2000Hz, and a noise density of no more than 30μg / √Hz. It is surface-mounted and fixed to the center of the fixture base using a dedicated bracket with a stiffness of at least 100N / mm to minimize signal attenuation. The sensor features a built-in anti-aliasing filter with a cutoff frequency of 1800Hz, enabling a data acquisition rate of 10kHz.

[0064] The laser displacement sensor, based on the principle of triangulation, measures distances from 5 to 50 mm, with a resolution of 0.005 mm and a linearity of ±0.1%. The transmitter and receiver are mounted at a 15° angle at the end of the fixture's telescopic arm, monitoring the relative displacement between the lead plate and the fixture in real time. The sensor incorporates an integrated temperature compensation module with a compensation range of -20°C to 60°C and an accuracy of ±0.01 mm.

[0065] 2. Radiation dose monitoring unit

[0066] The dual redundant scintillator dosimeter consists of a main sensor and a backup sensor. The main sensor uses NaI (Tl) crystal The response time is no more than 1 second, the range is 0-1000μSv / h, and the response deviation relative to 137Cs is no more than ±5% in the energy range of 30keV-10MeV; the backup sensor uses an effective area of ​​100mm 2 The Si semiconductor detector has a resolution of 0.1 μSv / h. The two data are compared in real time, triggering a redundancy check when the deviation exceeds 3%. A lead sleeve matching the screw's inner diameter, with a length of at least 10 mm and a lead equivalent of at least 1 mmPb, is inserted into the screw hole. The inner wall of the sleeve is threaded with a 1 mm pitch, providing a tight fit with the screw. Monte Carlo simulations (MCNP6) have verified that this structure can reduce the fixed-point leakage dose rate by over 90%.

[0067] (2) Edge computing and digital twin systems

[0068] 1. Intelligent computing power platform

[0069] The hardware architecture utilizes a heterogeneous computing chip, integrating an NPU with a computing power of at least 2TOPS, a CPU with a main frequency of 1.8GHz, and 4GB of RAM, supporting the deployment of TensorFlow Lite models. It also integrates an industrial-grade temperature sensor with an operating temperature range of -40°C to 85°C and a hardware watchdog to ensure stable 24 / 7 system operation.

[0070] The algorithm system consists of a preprocessing layer, a feature engineering layer, and a decision-making layer. The preprocessing layer applies 5-1000Hz bandpass filtering to sensor data and removes outliers based on the 3σ criterion, ensuring a data efficiency of at least 99%. The feature engineering layer extracts 20 characteristic parameters, including the root mean square value and kurtosis of the vibration signal, the peak-to-peak value and rate of change of the displacement signal, the cumulative value of the radiation dose, and the gradient of change. The decision-making layer uses an LSTM-CNN fusion model with a forward propagation time of no more than 10ms. Based on 5000 hours of accelerated aging data training, the life prediction error does not exceed 4.2%, and the diagnostic accuracy for loosening, corrosion, and leakage faults is no less than 96% (with an F1 score of no less than 0.92).

[0071] 2. Digital Twin Modeling and Application

[0072] Geometric modeling involved acquiring 3D point cloud data of the lead plate and fixture system through industrial CT scanning with a resolution of 0.1 mm. This data was then processed using GAMBIT software to generate a solid model. The mesh was refined to 1 mm for key locations, such as the fixture contact area and joints. For physical modeling, the lead plate was defined as an elastoplastic body (bilinear isotropic hardening model with a yield strength of 40 MPa) and the fixture as a rigid body in ANSYS Workbench. The contact type was set to "friction contact" (friction coefficient of 0.15). The stress distribution of the fixture system under vibration load was calculated with an accuracy of ±5 MPa. A conjugate heat transfer model was established using COMSOL Multiphysics, accounting for the lead plate's thermal conductivity (35 W / (m·K)), air convection (film coefficient of 10 W / (m2·K)), and radiation heat transfer (emissivity of 0.2). The temperature field calculation error was calculated to within 1°C.

[0073] Sensor data drives the digital twin with a cycle of 100ms. When the joint stress in the virtual model exceeds 80MPa or the temperature is higher than 65℃, the system automatically marks the red warning area and sends a shutdown signal to the PLC through the ModbusTCP protocol. The response time does not exceed 25 seconds.

[0074] (3) Communication and early warning mechanism

[0075] The transmission network supports both 5GNR (Sub-6GHz frequency band, peak rate of 1Gbps) and NB-IoT (low-power wide area network, transmission delay of less than 100ms) modes to meet the communication needs of different scenarios. The AES-256 encryption algorithm is used to protect data transmission and ensure the security of radiation monitoring data.

[0076] The multi-level warning strategy is as follows: Level 1 warning (yellow), when the vibration displacement exceeds 0.05mm or the radiation dose rate exceeds 2.5μSv / h, a local sound and light alarm with a volume of 85dB and a flash frequency of 2Hz is triggered; Level 2 warning (orange), if the abnormal fluctuation of the clamping force exceeds the set value by 20% or the coating corrosion depth exceeds 20μm, in addition to the local alarm, a text message notification is sent to the operation and maintenance terminal at the same time, and the response time does not exceed 30 seconds; Level 3 warning (red), when the joint leakage rate exceeds 0.1% or the lead plate stress exceeds 100MPa, the equipment power supply is automatically cut off, the backup shielding device is activated, and the supervision platform is reported, and the response time does not exceed 5 seconds.

[0077] Example 1: Fixing Lead Plates in Medical CT Rooms (Medium-Thickness Lead Plate Scenario)

[0078] (1) Application scenarios and design parameters

[0079] Scenario characteristics: A 128-row CT room in a Class A tertiary hospital implements GBZ130-2020 "Radiation Protection Requirements for Medical X-ray Diagnosis." The equipment's vibration frequency is primarily concentrated between 20 and 100 Hz, and it is disinfected with chlorine three times a day (available chlorine 500 ppm).

[0080] Lead plate parameters: lead-based composite plate with a graphene content of 1.0wt%, thickness 3mm, lead equivalent 3.0mmPb (equivalent to pure lead plate), in line with ASTMB29-18 standard

[0081] (2) Performance test data

[0082]

[0083]

[0084] Example 2: Fixing Lead Plates in Industrial NDT Rooms (Thick Lead Plates and High Vibration)

[0085] (1) Application scenarios and design parameters

[0086] Scene characteristics: X-ray inspection room in an automobile factory, implementing JB / T10045.3-2017 "Industrial X-ray Flaw Detector", ambient temperature 30±8℃, vibration frequency 50-300Hz, oil mist corrosion

[0087] Lead plate parameters: 10mm thick composite plate, lead equivalent 10.2mmPb, tested and certified by the China Institute of Metrology

[0088] (2) Performance test data

[0089]

[0090] Example 3: Fixing lead plates for spent fuel shielding in nuclear facilities (extreme environment scenario)

[0091] (1) Application scenarios and design parameters

[0092] Scene characteristics: A nuclear power plant spent fuel storage area, implementing HAF102-2016 "Nuclear Power Plant Design Safety Regulations", with a minimum winter temperature of -18°C and a mixed radiation field (γ+neutron).

[0093] Lead plate parameters: 50mm thick composite plate, lead equivalent 50.5mmPb, 3wt% boron element added to enhance neutron shielding, in line with RCC-M specifications

[0094] (2) Performance test data

[0095]

[0096] The above data demonstrates significant advantages in multi-scenario adaptability, installation and maintenance efficiency, protective performance, and intelligent capabilities. The system covers lead plate thicknesses ranging from 0.5 to 50 mm, and can withstand extreme environments ranging from -20°C to 60°C. Installation time in medical scenarios is 70% shorter than with traditional systems, while vibration fatigue life in industrial scenarios is tripled. The radiation leakage rate is ≤ 0.1% (compared to ≥ 2.5% for traditional systems), and the nuclear-grade neutron shielding efficiency reaches 98.5%. Intelligent monitoring enables fault warning within 25 seconds, with a lifespan prediction error of ≤ 5%. By integrating innovative materials, structural optimization, and intelligent algorithms, the system overcomes the bottlenecks of traditional fixed systems in mechanical reliability, environmental tolerance, and monitoring lag, providing efficient, safe, and intelligent radiation protection solutions for medical, industrial, and nuclear facilities.

[0097] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-scale adaptive fixing system for lead plates, characterized by: It includes a multi-scale adaptive mechanical fixation module, an environmental adaptive control module, and an intelligent monitoring and early warning system; The multi-scale adaptive mechanical fixation module includes a shape memory alloy drive fixture and a modular quick-connect assembly. The clamping arm of the shape memory alloy drive fixture is a three-degree-of-freedom structure, including a base, a rotary joint, a telescopic arm, and a pressure-bearing surface at the end. The shape memory alloy drive fixture adopts a dynamic force control and vibration suppression system, including an NTC thermistor, a PID controller, and a magnetorheological fluid damping chamber. The modular quick-connect assembly adopts a "cross trapezoidal tenon + elastic buckle" structure. The environmental adaptive control module includes a temperature and humidity coordinated control system and a lightweight composite lead plate; the temperature and humidity coordinated control system includes a dynamic temperature compensation device and a self-repairing nano-ceramic anti-corrosion coating; The intelligent monitoring and early warning system includes a multi-dimensional sensor array, edge computing and digital twin system, and communication and early warning mechanism; the multi-dimensional sensor array includes a vibration and displacement monitoring unit and a radiation dose monitoring unit; the vibration and displacement monitoring unit includes a MEMS acceleration sensor and a laser displacement sensor.

2. The multi-scale adaptive fixing system for lead plates according to claim 1, characterized in that: The base is made of 7075-T6 aluminum alloy and is hard anodized; the rotary joint is equipped with a biaxial flexible hinge; the telescopic arm has a built-in SMA coil spring; the end pressure-bearing surface is an arc-shaped surface, and the surface is sprayed with a 20μm polytetrafluoroethylene coating.

3. The multi-scale adaptive fixing system for lead plates according to claim 2, characterized in that: The NTC thermistor has an accuracy of ±0.3°C, and a temperature-stress mapping relationship is established based on the Burgers model. The clamping force is adjusted from 50 to 500N by a 0-12V driving voltage. The magnetorheological fluid damping cavity is a coaxial cylindrical type and is filled with MRF-132DG magnetorheological fluid containing 65% carbonyl iron powder.

4. The multi-scale adaptive fixing system for lead plates according to claim 2, characterized in that: The quick disassembly and assembly structure adopts a "vacuum adsorption + mechanical locking" composite structure. A 10mm diameter micro vacuum suction cup is embedded in the pressure-bearing surface, with a suction force of 5-50N and a response time of ≤1 second. The fixture and the support structure are connected by M6 quick-release bolts with a torque of 8-12N·m and a disassembly and assembly time of ≤30 seconds.

5. The multi-scale adaptive fixing system for lead plates according to claim 1, characterized in that: The main tenon of the modular quick connection component has a trapezoidal cross-section, a matching tolerance of H7 / g6, and can withstand a lateral tensile force of 500N when the insertion depth is ≥8mm; the auxiliary buckle has a built-in 0.3mm thick stainless steel spring sheet with an elastic coefficient of 5N / mm.

6. The multi-scale adaptive fixing system for lead plates according to claim 5, characterized in that: The main material of the modular quick connection component is TC4 titanium alloy, which is hot isostatically pressed at 1200°C and 150MPa, and a 5μm DLC coating is deposited on the surface; a 1mm thick Ω-type lead sealing strip is embedded in the joint.

7. The multi-scale adaptive fixing system for lead plates according to claim 1, characterized in that: The heating unit of the dynamic temperature compensation device is a 0.3mm thick PTC ceramic heating plate; the cooling unit is a 2mm diameter copper tube micro condenser with a serpentine pipe layout, and the temperature is controlled at 40±2°C at a flow rate of 0.5L / min; the temperature is controlled by a fuzzy PID controller, the PT100 sensor has an accuracy of ±0.5°C, a response time of ≤10 seconds, and a fluctuation range of ±2°C.

8. The multi-scale adaptive fixing system for lead plates according to claim 7, characterized in that: The bottom layer of the self-repairing nano-ceramic anti-corrosion coating is a 5μm SiO2 nano-sol layer with a porosity of ≤5%, and the surface layer is a 5μm DCPD microcapsule polyurethane layer with a microcapsule particle size of 5-10μm and a content of 15wt%. The tensile strength recovery rate after repair is ≥85%, and the weight loss rate after immersion in 5% NaCl solution for 1000 hours is ≤0.2%.

9. The multi-scale adaptive fixing system for lead plates according to claim 1, characterized in that: The lightweight composite lead plate is made of graphene-reinforced lead-based composite material, which is made by mixing lead powder and graphene oxide in a ratio of 99:1, and then undergoing high-energy ball milling, hydrogen reduction, and sintering. The density is 11.15 g / cm 3 , tensile strength 230MPa, 3mm thickness lead equivalent 3.1mmPb; edge processing 45° groove, sealant mixed with 5wt% nano-lead particles, seam leakage rate ≤0.07%.

10. The multi-scale adaptive fixing system for lead plates according to claim 1, characterized in that: The radiation dose monitoring unit adopts a dual-redundant scintillator dosimeter, the main sensor is a NaI (Tl) crystal, and the backup sensor is a Si semiconductor detector; the edge computing hardware integrates an NPU with a computing power ≥ 2TOPS, a 1.8GHz CPU and 4GBRAM, and the algorithm adopts an LSTM-CNN fusion model; the communication supports 5GNR and NB-IoT dual modes, adopts AES-256 encryption, and the response time of the three-level warning strategy is ≤30 seconds and ≤5 seconds respectively.

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